Commit | Line | Data |
---|---|---|
baf20995 MD |
1 | /* |
2 | * ltt-debugfs-abi.c | |
3 | * | |
4 | * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> | |
5 | * | |
6 | * LTTng debugfs ABI | |
7 | * | |
8 | * Mimic system calls for: | |
9 | * - session creation, returns a file descriptor or failure. | |
ad1c05e1 MD |
10 | * - channel creation, returns a file descriptor or failure. |
11 | * - Operates on a session file descriptor | |
12 | * - Takes all channel options as parameters. | |
13 | * - stream get, returns a file descriptor or failure. | |
14 | * - Operates on a channel file descriptor. | |
15 | * - stream notifier get, returns a file descriptor or failure. | |
16 | * - Operates on a channel file descriptor. | |
17 | * - event creation, returns a file descriptor or failure. | |
18 | * - Operates on a channel file descriptor | |
19 | * - Takes an event name as parameter | |
20 | * - Takes an instrumentation source as parameter | |
21 | * - e.g. tracepoints, dynamic_probes... | |
22 | * - Takes instrumentation source specific arguments. | |
baf20995 MD |
23 | */ |
24 | ||
11b5a3c2 | 25 | #include <linux/module.h> |
baf20995 | 26 | #include <linux/debugfs.h> |
11b5a3c2 MD |
27 | #include <linux/anon_inodes.h> |
28 | #include <linux/file.h> | |
29 | #include <linux/uaccess.h> | |
30 | #include <linux/slab.h> | |
b13f3ebe | 31 | #include "wrapper/vmalloc.h" /* for wrapper_vmalloc_sync_all() */ |
f3bc08c5 | 32 | #include "wrapper/ringbuffer/vfs.h" |
11b5a3c2 | 33 | #include "ltt-debugfs-abi.h" |
ad1c05e1 | 34 | #include "ltt-events.h" |
80c16bcf | 35 | #include "ltt-tracer.h" |
baf20995 MD |
36 | |
37 | /* | |
38 | * This is LTTng's own personal way to create a system call as an external | |
39 | * module. We use ioctl() on /sys/kernel/debug/lttng. | |
40 | */ | |
41 | ||
42 | static struct dentry *lttng_dentry; | |
ad1c05e1 MD |
43 | static const struct file_operations lttng_fops; |
44 | static const struct file_operations lttng_session_fops; | |
45 | static const struct file_operations lttng_channel_fops; | |
5dbbdb43 | 46 | static const struct file_operations lttng_metadata_fops; |
305d3e42 | 47 | static const struct file_operations lttng_event_fops; |
baf20995 | 48 | |
5dbbdb43 MD |
49 | enum channel_type { |
50 | PER_CPU_CHANNEL, | |
5dbbdb43 MD |
51 | METADATA_CHANNEL, |
52 | }; | |
53 | ||
ad1c05e1 | 54 | static |
baf20995 MD |
55 | int lttng_abi_create_session(void) |
56 | { | |
57 | struct ltt_session *session; | |
c0e31d2e | 58 | struct file *session_file; |
11b5a3c2 | 59 | int session_fd, ret; |
baf20995 | 60 | |
653fe716 | 61 | session = ltt_session_create(); |
baf20995 MD |
62 | if (!session) |
63 | return -ENOMEM; | |
1c25284c | 64 | session_fd = get_unused_fd(); |
baf20995 MD |
65 | if (session_fd < 0) { |
66 | ret = session_fd; | |
67 | goto fd_error; | |
68 | } | |
c0e31d2e | 69 | session_file = anon_inode_getfile("[lttng_session]", |
ad1c05e1 | 70 | <tng_session_fops, |
baf20995 | 71 | session, O_RDWR); |
c0e31d2e MD |
72 | if (IS_ERR(session_file)) { |
73 | ret = PTR_ERR(session_file); | |
baf20995 MD |
74 | goto file_error; |
75 | } | |
c0e31d2e MD |
76 | session->file = session_file; |
77 | fd_install(session_fd, session_file); | |
baf20995 MD |
78 | return session_fd; |
79 | ||
80 | file_error: | |
81 | put_unused_fd(session_fd); | |
82 | fd_error: | |
83 | ltt_session_destroy(session); | |
84 | return ret; | |
85 | } | |
86 | ||
271b6681 MD |
87 | static |
88 | int lttng_abi_tracepoint_list(void) | |
89 | { | |
90 | struct file *tracepoint_list_file; | |
91 | int file_fd, ret; | |
92 | ||
93 | file_fd = get_unused_fd(); | |
94 | if (file_fd < 0) { | |
95 | ret = file_fd; | |
96 | goto fd_error; | |
97 | } | |
30f18bf0 | 98 | |
271b6681 MD |
99 | tracepoint_list_file = anon_inode_getfile("[lttng_session]", |
100 | <tng_tracepoint_list_fops, | |
101 | NULL, O_RDWR); | |
102 | if (IS_ERR(tracepoint_list_file)) { | |
103 | ret = PTR_ERR(tracepoint_list_file); | |
104 | goto file_error; | |
105 | } | |
30f18bf0 MD |
106 | ret = lttng_tracepoint_list_fops.open(NULL, tracepoint_list_file); |
107 | if (ret < 0) | |
108 | goto open_error; | |
271b6681 | 109 | fd_install(file_fd, tracepoint_list_file); |
30f18bf0 MD |
110 | if (file_fd < 0) { |
111 | ret = file_fd; | |
112 | goto fd_error; | |
113 | } | |
271b6681 MD |
114 | return file_fd; |
115 | ||
30f18bf0 MD |
116 | open_error: |
117 | fput(tracepoint_list_file); | |
271b6681 MD |
118 | file_error: |
119 | put_unused_fd(file_fd); | |
120 | fd_error: | |
121 | return ret; | |
122 | } | |
123 | ||
80c16bcf MD |
124 | static |
125 | long lttng_abi_tracer_version(struct file *file, | |
126 | struct lttng_kernel_tracer_version __user *uversion_param) | |
127 | { | |
128 | struct lttng_kernel_tracer_version v; | |
129 | ||
130 | v.version = LTTNG_VERSION; | |
131 | v.patchlevel = LTTNG_PATCHLEVEL; | |
132 | v.sublevel = LTTNG_SUBLEVEL; | |
133 | ||
134 | if (copy_to_user(uversion_param, &v, sizeof(v))) | |
135 | return -EFAULT; | |
136 | return 0; | |
137 | } | |
138 | ||
8070f5c0 MD |
139 | static |
140 | long lttng_abi_add_context(struct file *file, | |
141 | struct lttng_kernel_context __user *ucontext_param, | |
142 | struct lttng_ctx **ctx, struct ltt_session *session) | |
143 | { | |
144 | struct lttng_kernel_context context_param; | |
145 | ||
146 | if (session->been_active) | |
147 | return -EPERM; | |
148 | ||
149 | if (copy_from_user(&context_param, ucontext_param, sizeof(context_param))) | |
150 | return -EFAULT; | |
151 | ||
152 | switch (context_param.ctx) { | |
153 | case LTTNG_CONTEXT_PID: | |
154 | return lttng_add_pid_to_ctx(ctx); | |
155 | case LTTNG_CONTEXT_PERF_COUNTER: | |
156 | return -ENOSYS; | |
157 | default: | |
158 | return -EINVAL; | |
159 | } | |
160 | } | |
161 | ||
ad1c05e1 MD |
162 | /** |
163 | * lttng_ioctl - lttng syscall through ioctl | |
164 | * | |
c0e31d2e | 165 | * @file: the file |
ad1c05e1 MD |
166 | * @cmd: the command |
167 | * @arg: command arg | |
168 | * | |
169 | * This ioctl implements lttng commands: | |
38d024ae | 170 | * LTTNG_KERNEL_SESSION |
ad1c05e1 | 171 | * Returns a LTTng trace session file descriptor |
271b6681 MD |
172 | * LTTNG_KERNEL_TRACER_VERSION |
173 | * Returns the LTTng kernel tracer version | |
174 | * LTTNG_KERNEL_TRACEPOINT_LIST | |
175 | * Returns a file descriptor listing available tracepoints | |
ad1c05e1 MD |
176 | * |
177 | * The returned session will be deleted when its file descriptor is closed. | |
178 | */ | |
179 | static | |
c0e31d2e | 180 | long lttng_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 MD |
181 | { |
182 | switch (cmd) { | |
38d024ae | 183 | case LTTNG_KERNEL_SESSION: |
ad1c05e1 | 184 | return lttng_abi_create_session(); |
80c16bcf MD |
185 | case LTTNG_KERNEL_TRACER_VERSION: |
186 | return lttng_abi_tracer_version(file, | |
187 | (struct lttng_kernel_tracer_version __user *) arg); | |
271b6681 MD |
188 | case LTTNG_KERNEL_TRACEPOINT_LIST: |
189 | return lttng_abi_tracepoint_list(); | |
ad1c05e1 MD |
190 | default: |
191 | return -ENOIOCTLCMD; | |
192 | } | |
193 | } | |
194 | ||
ad1c05e1 MD |
195 | static const struct file_operations lttng_fops = { |
196 | .unlocked_ioctl = lttng_ioctl, | |
197 | #ifdef CONFIG_COMPAT | |
03037b98 | 198 | .compat_ioctl = lttng_ioctl, |
ad1c05e1 | 199 | #endif |
11b5a3c2 | 200 | }; |
ad1c05e1 | 201 | |
5dbbdb43 MD |
202 | /* |
203 | * We tolerate no failure in this function (if one happens, we print a dmesg | |
204 | * error, but cannot return any error, because the channel information is | |
205 | * invariant. | |
206 | */ | |
207 | static | |
208 | void lttng_metadata_create_events(struct file *channel_file) | |
209 | { | |
210 | struct ltt_channel *channel = channel_file->private_data; | |
e70a4758 | 211 | static struct lttng_kernel_event metadata_params = { |
ab2277d6 | 212 | .instrumentation = LTTNG_KERNEL_TRACEPOINT, |
e70a4758 MD |
213 | .name = "lttng_metadata", |
214 | }; | |
5dbbdb43 MD |
215 | struct ltt_event *event; |
216 | int ret; | |
5dbbdb43 | 217 | |
5dbbdb43 MD |
218 | /* |
219 | * We tolerate no failure path after event creation. It will stay | |
220 | * invariant for the rest of the session. | |
221 | */ | |
30bdb6e4 | 222 | event = ltt_event_create(channel, &metadata_params, NULL); |
5dbbdb43 | 223 | if (!event) { |
588e6a7f | 224 | ret = -EINVAL; |
271b6681 | 225 | goto create_error; |
5dbbdb43 MD |
226 | } |
227 | return; | |
228 | ||
85a9ca7f | 229 | create_error: |
5dbbdb43 MD |
230 | WARN_ON(1); |
231 | return; /* not allowed to return error */ | |
232 | } | |
233 | ||
234 | static | |
c0e31d2e | 235 | int lttng_abi_create_channel(struct file *session_file, |
38d024ae | 236 | struct lttng_kernel_channel __user *uchan_param, |
5dbbdb43 | 237 | enum channel_type channel_type) |
baf20995 | 238 | { |
c0e31d2e | 239 | struct ltt_session *session = session_file->private_data; |
5dbbdb43 MD |
240 | const struct file_operations *fops; |
241 | const char *transport_name; | |
baf20995 | 242 | struct ltt_channel *chan; |
c0e31d2e | 243 | struct file *chan_file; |
38d024ae | 244 | struct lttng_kernel_channel chan_param; |
baf20995 | 245 | int chan_fd; |
ad1c05e1 | 246 | int ret = 0; |
baf20995 | 247 | |
653fe716 | 248 | if (copy_from_user(&chan_param, uchan_param, sizeof(chan_param))) |
baf20995 | 249 | return -EFAULT; |
1c25284c | 250 | chan_fd = get_unused_fd(); |
baf20995 MD |
251 | if (chan_fd < 0) { |
252 | ret = chan_fd; | |
253 | goto fd_error; | |
254 | } | |
c0e31d2e | 255 | chan_file = anon_inode_getfile("[lttng_channel]", |
ad1c05e1 | 256 | <tng_channel_fops, |
03037b98 | 257 | NULL, O_RDWR); |
c0e31d2e MD |
258 | if (IS_ERR(chan_file)) { |
259 | ret = PTR_ERR(chan_file); | |
baf20995 MD |
260 | goto file_error; |
261 | } | |
5dbbdb43 MD |
262 | switch (channel_type) { |
263 | case PER_CPU_CHANNEL: | |
264 | transport_name = chan_param.overwrite ? | |
265 | "relay-overwrite" : "relay-discard"; | |
266 | fops = <tng_channel_fops; | |
267 | break; | |
5dbbdb43 | 268 | case METADATA_CHANNEL: |
881833e3 | 269 | transport_name = "relay-metadata"; |
5dbbdb43 MD |
270 | fops = <tng_metadata_fops; |
271 | break; | |
272 | default: | |
273 | transport_name = "<unknown>"; | |
274 | break; | |
275 | } | |
03037b98 MD |
276 | /* |
277 | * We tolerate no failure path after channel creation. It will stay | |
278 | * invariant for the rest of the session. | |
279 | */ | |
5dbbdb43 | 280 | chan = ltt_channel_create(session, transport_name, NULL, |
11b5a3c2 MD |
281 | chan_param.subbuf_size, |
282 | chan_param.num_subbuf, | |
283 | chan_param.switch_timer_interval, | |
284 | chan_param.read_timer_interval); | |
03037b98 | 285 | if (!chan) { |
f3d01b96 | 286 | ret = -EINVAL; |
03037b98 MD |
287 | goto chan_error; |
288 | } | |
11b5a3c2 | 289 | chan->file = chan_file; |
c0e31d2e MD |
290 | chan_file->private_data = chan; |
291 | fd_install(chan_fd, chan_file); | |
cd4bd11f | 292 | if (channel_type == METADATA_CHANNEL) { |
cd4bd11f | 293 | session->metadata = chan; |
4f1c3952 | 294 | lttng_metadata_create_events(chan_file); |
cd4bd11f | 295 | } |
5dbbdb43 | 296 | |
ad1c05e1 | 297 | /* The channel created holds a reference on the session */ |
b0caa15a | 298 | atomic_long_inc(&session_file->f_count); |
ad1c05e1 | 299 | |
baf20995 MD |
300 | return chan_fd; |
301 | ||
03037b98 | 302 | chan_error: |
c0e31d2e | 303 | fput(chan_file); |
baf20995 MD |
304 | file_error: |
305 | put_unused_fd(chan_fd); | |
306 | fd_error: | |
baf20995 MD |
307 | return ret; |
308 | } | |
309 | ||
310 | /** | |
ad1c05e1 | 311 | * lttng_session_ioctl - lttng session fd ioctl |
baf20995 | 312 | * |
c0e31d2e | 313 | * @file: the file |
baf20995 MD |
314 | * @cmd: the command |
315 | * @arg: command arg | |
316 | * | |
317 | * This ioctl implements lttng commands: | |
38d024ae | 318 | * LTTNG_KERNEL_CHANNEL |
baf20995 | 319 | * Returns a LTTng channel file descriptor |
8070f5c0 MD |
320 | * LTTNG_KERNEL_SESSION_START |
321 | * Starts tracing session | |
322 | * LTTNG_KERNEL_SESSION_STOP | |
323 | * Stops tracing session | |
324 | * LTTNG_KERNEL_METADATA | |
325 | * Returns a LTTng metadata file descriptor | |
ad1c05e1 MD |
326 | * |
327 | * The returned channel will be deleted when its file descriptor is closed. | |
328 | */ | |
329 | static | |
c0e31d2e | 330 | long lttng_session_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
ad1c05e1 | 331 | { |
c0e31d2e MD |
332 | struct ltt_session *session = file->private_data; |
333 | ||
ad1c05e1 | 334 | switch (cmd) { |
38d024ae | 335 | case LTTNG_KERNEL_CHANNEL: |
5dbbdb43 | 336 | return lttng_abi_create_channel(file, |
38d024ae | 337 | (struct lttng_kernel_channel __user *) arg, |
5dbbdb43 | 338 | PER_CPU_CHANNEL); |
38d024ae | 339 | case LTTNG_KERNEL_SESSION_START: |
c0e31d2e | 340 | return ltt_session_start(session); |
38d024ae | 341 | case LTTNG_KERNEL_SESSION_STOP: |
c0e31d2e | 342 | return ltt_session_stop(session); |
38d024ae | 343 | case LTTNG_KERNEL_METADATA: |
5dbbdb43 | 344 | return lttng_abi_create_channel(file, |
38d024ae | 345 | (struct lttng_kernel_channel __user *) arg, |
5dbbdb43 | 346 | METADATA_CHANNEL); |
ad1c05e1 MD |
347 | default: |
348 | return -ENOIOCTLCMD; | |
349 | } | |
350 | } | |
351 | ||
03037b98 MD |
352 | /* |
353 | * Called when the last file reference is dropped. | |
354 | * | |
355 | * Big fat note: channels and events are invariant for the whole session after | |
356 | * their creation. So this session destruction also destroys all channel and | |
357 | * event structures specific to this session (they are not destroyed when their | |
358 | * individual file is released). | |
359 | */ | |
ad1c05e1 | 360 | static |
03037b98 | 361 | int lttng_session_release(struct inode *inode, struct file *file) |
ad1c05e1 | 362 | { |
03037b98 | 363 | struct ltt_session *session = file->private_data; |
c269fff4 MD |
364 | |
365 | if (session) | |
366 | ltt_session_destroy(session); | |
11b5a3c2 | 367 | return 0; |
ad1c05e1 | 368 | } |
ad1c05e1 MD |
369 | |
370 | static const struct file_operations lttng_session_fops = { | |
03037b98 | 371 | .release = lttng_session_release, |
ad1c05e1 MD |
372 | .unlocked_ioctl = lttng_session_ioctl, |
373 | #ifdef CONFIG_COMPAT | |
03037b98 | 374 | .compat_ioctl = lttng_session_ioctl, |
ad1c05e1 | 375 | #endif |
11b5a3c2 | 376 | }; |
ad1c05e1 MD |
377 | |
378 | static | |
c0e31d2e | 379 | int lttng_abi_open_stream(struct file *channel_file) |
ad1c05e1 | 380 | { |
c0e31d2e | 381 | struct ltt_channel *channel = channel_file->private_data; |
ad1c05e1 MD |
382 | struct lib_ring_buffer *buf; |
383 | int stream_fd, ret; | |
11b5a3c2 | 384 | struct file *stream_file; |
ad1c05e1 | 385 | |
11b5a3c2 | 386 | buf = channel->ops->buffer_read_open(channel->chan); |
ad1c05e1 MD |
387 | if (!buf) |
388 | return -ENOENT; | |
389 | ||
1c25284c | 390 | stream_fd = get_unused_fd(); |
ad1c05e1 MD |
391 | if (stream_fd < 0) { |
392 | ret = stream_fd; | |
393 | goto fd_error; | |
394 | } | |
c0e31d2e | 395 | stream_file = anon_inode_getfile("[lttng_stream]", |
7f57c73c | 396 | &lib_ring_buffer_file_operations, |
ad1c05e1 | 397 | buf, O_RDWR); |
c0e31d2e MD |
398 | if (IS_ERR(stream_file)) { |
399 | ret = PTR_ERR(stream_file); | |
ad1c05e1 MD |
400 | goto file_error; |
401 | } | |
409453cb MD |
402 | /* |
403 | * OPEN_FMODE, called within anon_inode_getfile/alloc_file, don't honor | |
404 | * FMODE_LSEEK, FMODE_PREAD nor FMODE_PWRITE. We need to read from this | |
405 | * file descriptor, so we set FMODE_PREAD here. | |
406 | */ | |
d7b6f197 | 407 | stream_file->f_mode |= FMODE_PREAD; |
c0e31d2e | 408 | fd_install(stream_fd, stream_file); |
dda6a249 MD |
409 | /* |
410 | * The stream holds a reference to the channel within the generic ring | |
411 | * buffer library, so no need to hold a refcount on the channel and | |
412 | * session files here. | |
413 | */ | |
ad1c05e1 MD |
414 | return stream_fd; |
415 | ||
416 | file_error: | |
417 | put_unused_fd(stream_fd); | |
418 | fd_error: | |
11b5a3c2 | 419 | channel->ops->buffer_read_close(buf); |
ad1c05e1 MD |
420 | return ret; |
421 | } | |
422 | ||
653fe716 | 423 | static |
c0e31d2e | 424 | int lttng_abi_create_event(struct file *channel_file, |
38d024ae | 425 | struct lttng_kernel_event __user *uevent_param) |
653fe716 | 426 | { |
c0e31d2e | 427 | struct ltt_channel *channel = channel_file->private_data; |
653fe716 | 428 | struct ltt_event *event; |
38d024ae | 429 | struct lttng_kernel_event event_param; |
653fe716 | 430 | int event_fd, ret; |
11b5a3c2 | 431 | struct file *event_file; |
653fe716 MD |
432 | |
433 | if (copy_from_user(&event_param, uevent_param, sizeof(event_param))) | |
434 | return -EFAULT; | |
30bdb6e4 | 435 | event_param.name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
e0a7a7c4 | 436 | switch (event_param.instrumentation) { |
ab2277d6 | 437 | case LTTNG_KERNEL_KPROBE: |
e0a7a7c4 MD |
438 | event_param.u.kprobe.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
439 | break; | |
ab2277d6 | 440 | case LTTNG_KERNEL_FUNCTION: |
e0a7a7c4 MD |
441 | event_param.u.ftrace.symbol_name[LTTNG_SYM_NAME_LEN - 1] = '\0'; |
442 | break; | |
443 | default: | |
444 | break; | |
445 | } | |
1c25284c | 446 | event_fd = get_unused_fd(); |
653fe716 MD |
447 | if (event_fd < 0) { |
448 | ret = event_fd; | |
449 | goto fd_error; | |
450 | } | |
c0e31d2e | 451 | event_file = anon_inode_getfile("[lttng_event]", |
3b923e5b | 452 | <tng_event_fops, |
03037b98 | 453 | NULL, O_RDWR); |
c0e31d2e MD |
454 | if (IS_ERR(event_file)) { |
455 | ret = PTR_ERR(event_file); | |
653fe716 MD |
456 | goto file_error; |
457 | } | |
03037b98 MD |
458 | /* |
459 | * We tolerate no failure path after event creation. It will stay | |
460 | * invariant for the rest of the session. | |
461 | */ | |
30bdb6e4 | 462 | event = ltt_event_create(channel, &event_param, NULL); |
03037b98 | 463 | if (!event) { |
271b6681 | 464 | ret = -EINVAL; |
d6d808f3 | 465 | goto event_error; |
03037b98 | 466 | } |
c0e31d2e MD |
467 | event_file->private_data = event; |
468 | fd_install(event_fd, event_file); | |
653fe716 | 469 | /* The event holds a reference on the channel */ |
b0caa15a | 470 | atomic_long_inc(&channel_file->f_count); |
653fe716 MD |
471 | return event_fd; |
472 | ||
03037b98 | 473 | event_error: |
c0e31d2e | 474 | fput(event_file); |
653fe716 MD |
475 | file_error: |
476 | put_unused_fd(event_fd); | |
477 | fd_error: | |
653fe716 MD |
478 | return ret; |
479 | } | |
ad1c05e1 MD |
480 | |
481 | /** | |
482 | * lttng_channel_ioctl - lttng syscall through ioctl | |
483 | * | |
c0e31d2e | 484 | * @file: the file |
ad1c05e1 MD |
485 | * @cmd: the command |
486 | * @arg: command arg | |
487 | * | |
488 | * This ioctl implements lttng commands: | |
38d024ae | 489 | * LTTNG_KERNEL_STREAM |
ad1c05e1 MD |
490 | * Returns an event stream file descriptor or failure. |
491 | * (typically, one event stream records events from one CPU) | |
38d024ae | 492 | * LTTNG_KERNEL_EVENT |
ad1c05e1 | 493 | * Returns an event file descriptor or failure. |
8070f5c0 MD |
494 | * LTTNG_KERNEL_CONTEXT |
495 | * Prepend a context field to each event in the channel | |
baf20995 | 496 | * |
baf20995 MD |
497 | * Channel and event file descriptors also hold a reference on the session. |
498 | */ | |
ad1c05e1 | 499 | static |
c0e31d2e | 500 | long lttng_channel_ioctl(struct file *file, unsigned int cmd, unsigned long arg) |
baf20995 | 501 | { |
8070f5c0 MD |
502 | struct ltt_channel *channel = file->private_data; |
503 | ||
baf20995 | 504 | switch (cmd) { |
38d024ae | 505 | case LTTNG_KERNEL_STREAM: |
c0e31d2e | 506 | return lttng_abi_open_stream(file); |
38d024ae MD |
507 | case LTTNG_KERNEL_EVENT: |
508 | return lttng_abi_create_event(file, (struct lttng_kernel_event __user *) arg); | |
8070f5c0 MD |
509 | case LTTNG_KERNEL_CONTEXT: |
510 | return lttng_abi_add_context(file, | |
511 | (struct lttng_kernel_context __user *) arg, | |
512 | &channel->ctx, channel->session); | |
baf20995 MD |
513 | default: |
514 | return -ENOIOCTLCMD; | |
515 | } | |
516 | } | |
517 | ||
5dbbdb43 MD |
518 | /** |
519 | * lttng_metadata_ioctl - lttng syscall through ioctl | |
520 | * | |
521 | * @file: the file | |
522 | * @cmd: the command | |
523 | * @arg: command arg | |
524 | * | |
525 | * This ioctl implements lttng commands: | |
38d024ae | 526 | * LTTNG_KERNEL_STREAM |
5dbbdb43 MD |
527 | * Returns an event stream file descriptor or failure. |
528 | * | |
529 | * Channel and event file descriptors also hold a reference on the session. | |
530 | */ | |
531 | static | |
532 | long lttng_metadata_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
533 | { | |
534 | switch (cmd) { | |
38d024ae | 535 | case LTTNG_KERNEL_STREAM: |
5dbbdb43 MD |
536 | return lttng_abi_open_stream(file); |
537 | default: | |
538 | return -ENOIOCTLCMD; | |
539 | } | |
540 | } | |
541 | ||
3b923e5b MD |
542 | /* TODO: poll */ |
543 | #if 0 | |
653fe716 MD |
544 | /** |
545 | * lttng_channel_poll - lttng stream addition/removal monitoring | |
546 | * | |
c0e31d2e | 547 | * @file: the file |
653fe716 MD |
548 | * @wait: poll table |
549 | */ | |
c0e31d2e | 550 | unsigned int lttng_channel_poll(struct file *file, poll_table *wait) |
653fe716 | 551 | { |
c0e31d2e | 552 | struct ltt_channel *channel = file->private_data; |
653fe716 MD |
553 | unsigned int mask = 0; |
554 | ||
c0e31d2e | 555 | if (file->f_mode & FMODE_READ) { |
653fe716 | 556 | poll_wait_set_exclusive(wait); |
c0e31d2e | 557 | poll_wait(file, &channel->notify_wait, wait); |
653fe716 MD |
558 | |
559 | /* TODO: identify when the channel is being finalized. */ | |
560 | if (finalized) | |
561 | return POLLHUP; | |
562 | else | |
563 | return POLLIN | POLLRDNORM; | |
564 | } | |
565 | return mask; | |
566 | ||
567 | } | |
3b923e5b | 568 | #endif //0 |
653fe716 | 569 | |
0a84a57f MD |
570 | static |
571 | int lttng_channel_release(struct inode *inode, struct file *file) | |
572 | { | |
573 | struct ltt_channel *channel = file->private_data; | |
c269fff4 MD |
574 | |
575 | if (channel) | |
576 | fput(channel->session->file); | |
0a84a57f MD |
577 | return 0; |
578 | } | |
579 | ||
ad1c05e1 | 580 | static const struct file_operations lttng_channel_fops = { |
03037b98 | 581 | .release = lttng_channel_release, |
3b923e5b MD |
582 | /* TODO */ |
583 | #if 0 | |
653fe716 | 584 | .poll = lttng_channel_poll, |
3b923e5b | 585 | #endif //0 |
ad1c05e1 | 586 | .unlocked_ioctl = lttng_channel_ioctl, |
baf20995 | 587 | #ifdef CONFIG_COMPAT |
03037b98 | 588 | .compat_ioctl = lttng_channel_ioctl, |
baf20995 | 589 | #endif |
11b5a3c2 | 590 | }; |
baf20995 | 591 | |
5dbbdb43 MD |
592 | static const struct file_operations lttng_metadata_fops = { |
593 | .release = lttng_channel_release, | |
594 | .unlocked_ioctl = lttng_metadata_ioctl, | |
595 | #ifdef CONFIG_COMPAT | |
596 | .compat_ioctl = lttng_metadata_ioctl, | |
597 | #endif | |
598 | }; | |
599 | ||
8070f5c0 MD |
600 | /** |
601 | * lttng_event_ioctl - lttng syscall through ioctl | |
602 | * | |
603 | * @file: the file | |
604 | * @cmd: the command | |
605 | * @arg: command arg | |
606 | * | |
607 | * This ioctl implements lttng commands: | |
608 | * LTTNG_KERNEL_STREAM | |
609 | * Returns an event stream file descriptor or failure. | |
610 | * (typically, one event stream records events from one CPU) | |
611 | * LTTNG_KERNEL_EVENT | |
612 | * Returns an event file descriptor or failure. | |
613 | * LTTNG_KERNEL_CONTEXT | |
614 | * Prepend a context field to each record of this event | |
615 | */ | |
616 | static | |
617 | long lttng_event_ioctl(struct file *file, unsigned int cmd, unsigned long arg) | |
618 | { | |
619 | struct ltt_event *event = file->private_data; | |
620 | ||
621 | switch (cmd) { | |
622 | case LTTNG_KERNEL_CONTEXT: | |
623 | return lttng_abi_add_context(file, | |
624 | (struct lttng_kernel_context __user *) arg, | |
625 | &event->ctx, event->chan->session); | |
626 | default: | |
627 | return -ENOIOCTLCMD; | |
628 | } | |
629 | } | |
630 | ||
0a84a57f MD |
631 | static |
632 | int lttng_event_release(struct inode *inode, struct file *file) | |
633 | { | |
634 | struct ltt_event *event = file->private_data; | |
c269fff4 | 635 | |
aa7c23a9 | 636 | if (event) |
c269fff4 | 637 | fput(event->chan->file); |
0a84a57f MD |
638 | return 0; |
639 | } | |
640 | ||
3b923e5b | 641 | /* TODO: filter control ioctl */ |
0a84a57f MD |
642 | static const struct file_operations lttng_event_fops = { |
643 | .release = lttng_event_release, | |
8070f5c0 MD |
644 | .unlocked_ioctl = lttng_event_ioctl, |
645 | #ifdef CONFIG_COMPAT | |
646 | .compat_ioctl = lttng_event_ioctl, | |
647 | #endif | |
11b5a3c2 | 648 | }; |
0a84a57f | 649 | |
1c25284c | 650 | int __init ltt_debugfs_abi_init(void) |
baf20995 MD |
651 | { |
652 | int ret = 0; | |
653 | ||
6d2a620c | 654 | wrapper_vmalloc_sync_all(); |
11b5a3c2 | 655 | lttng_dentry = debugfs_create_file("lttng", S_IWUSR, NULL, NULL, |
f3d01b96 | 656 | <tng_fops); |
11b5a3c2 | 657 | if (IS_ERR(lttng_dentry) || !lttng_dentry) { |
baf20995 MD |
658 | printk(KERN_ERR "Error creating LTTng control file\n"); |
659 | ret = -ENOMEM; | |
660 | goto error; | |
661 | } | |
662 | error: | |
663 | return ret; | |
664 | } | |
665 | ||
1c25284c | 666 | void __exit ltt_debugfs_abi_exit(void) |
baf20995 | 667 | { |
11b5a3c2 | 668 | debugfs_remove(lttng_dentry); |
baf20995 | 669 | } |